Blob
A large temporary data object designed to carry rollup data more cheaply than permanent execution calldata.
Explain Like I'm 12
A large temporary data object designed to carry rollup data more cheaply than permanent execution calldata.
Why It Matters
Scaling concepts explain how blockchain systems increase capacity while balancing security and decentralization.
How It Works
Blobs are carried in a specialized sidecar alongside a standard Ethereum block. They are not stored in the Ethereum Virtual Machine's state permanently, but are gossiped through the network nodes. After a short retention period, nodes delete the blob data, while the cryptographic commitment remains available on-chain for verification purposes.
Real-World Example
Optimism and Arbitrum use blobs to submit transaction batches to Ethereum, lowering user fees.
Advantages
- Reduces L2 transaction costs
- Optimizes Ethereum storage efficiency
- Scales blockchain data throughput
Limitations
- Data availability is time-limited
- Requires node storage synchronization
Common Misconceptions
- Users think blobs stay on the blockchain forever, but they are pruned for efficiency.
- Many believe blobs are general-purpose storage for dApps, but they are specifically for rollups.
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Related Terms
Data Availability
The property that transaction and state-transition data needed to verify a blockchain or rollup is accessible to participants.
Layer 2
Layer 2 refers to secondary protocols built on top of an existing Layer 1 blockchain to improve scalability, efficiency, and speed. These solutions move the bulk of transaction processing off the main chain, while still inheriting the security and finality provided by the base Layer 1. By batching transactions or using alternative data availability paths, Layer 2 networks reduce congestion and transaction costs on the main ledger, facilitating wider mainstream adoption of decentralized applications.
Rollup
A Rollup is a Layer 2 scaling solution that increases Ethereum's transaction throughput by processing transactions off-chain and then posting the compressed data to the Ethereum mainnet. By handling the heavy lifting of computation externally and only using the mainnet for data availability and settlement, rollups drastically reduce gas fees and increase transaction speed while inheriting the security properties of the Ethereum base layer.
Rollup
A rollup is a scaling technique that moves computation and state storage off the main blockchain (Layer 1). It 'rolls up' hundreds or thousands of transactions into a single batch, generating a cryptographic summary that is posted back to the main chain. This drastically reduces the data requirements on the main network while ensuring that the validity of the bundled transactions can be audited and verified by anyone, maintaining the decentralization of the parent chain.
Throughput
The amount of transaction or computational activity a blockchain can process over a given period.